Ekiner etal	def. pub.
process for measuring polymer content sn



35 W O DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Identification is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets 0! drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 15, 1969 665 767 PROCESS FOR MEASURING POLYMER CONTENT Okan Ekiner, 1401 Maryland Ave., Wilmington, Del. 19805, and Edward Peter Goflinet, Jr., 2403 Annwood Drive, Wilmington, Del. 19803 Filed Sept. 6, 1967. Published Apr. 15, 1969 Class 26080.78 1 Sheet Drawing. 11 Pages Specification Polymer content of a solution containing a plurality of volatile constituents, such as solvent, monomers, etc., is monitored by (1) vaporizing a portion of the volatile constituents from the solution, as by stripping the solution with organic solvent vapor; (2) condensing a small portion (e.g., less than about five mole percent, preferably less than two mole percent) of the vaporized portion to a condensate composition substantially the same as the composition of Volatile constituents in the polymer solution; and (3) comparing the refractive index of the condensate with that of the solution, as with a differential refractometer such as is described in United States Patent No. 2,612,- 814. Polymer content is then determined, e.g., by inspecting a plot of instrument output versus polymer content. Temperature and pressure of vaporization and condensation may be taken into account in calibrating the said plot. The invention is described in connection with polymerization of ethylene, propylene, and a non-conjugated hydrocarbon diene but is broadly applicable to determining the content of any non-volatile component in a solution of a plurality of volatile constituents so long as an appreciable dilference exists between refractive indices of the various constituents.

April 15, 1969 RECYOLE yL J STRIPPING SOLVENT O. EKINER ETAL DEF. PUB.

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o c: 2 2 '5 a z o J o D- INVENTORS OKAN EKINER EDWARD PETER GOFFINET JR.

ATTORNEY 

814. POLYMER CONTENT IS THEN DETERMINED, E.G., BY INSPECTING A PLOT OF INSTRUMENT OUTPUT VERSUS POLYMER CONTENT. TEMPERATURE AND PRESSURE OF VAPORIZATION AND CONDENSATION MAY BE TAKEN INTO ACCOUNT IN CALIBRATING THE SAID PLOT. THE INVENTION IS DESCRIBED IN CONNECTION WITH POLYMERIZATION OF ETHYLENE, PROPYLENE, AND A NON-CONJUGATED HYDROCARBON DIENE BUT IS BROADLY APPLICABLE TO DETERMINING THE CONTENT OF ANY NON-VOLATILE COMPONENT IN A SOLUTION OF A PLURALITY OF VOLATILE CONSTITUENTS SO LONG AS AN APPECIABLE DIFFERENCE EXISTS BETWEEN REFRACTIVE INDICES OF THE VARIOUS CONSTITUENTS. 